docs: def content_method(name):
      """
      Delegates a method to the first sibling in a RiakObject, raising
      an error when the object is in conflict.
      """
      def _delegate(self, *args, **kwargs):
          if len(self.siblings) != 1:
              raise ConflictError()
          return getattr(self.siblings[0], name).__call__(*args, **kwargs)
  
      _delegate.__doc__ = getattr(RiakContent, name).__doc__
  
      return _delegate